We have been looking at a lot of these, but they all seem to fall short on the video conferencing. We are looking to have possibly up to 20 participants who want to broadcast video simultaneously. Not as concerned about the audio, will probably use a separate audio-conferencing tool in conjunction unless everyone wants to invest in a headset
Adobe seems to accomodate large amount of cams, as well as hearme.com (part of Paltalk). I think some of these get really expensive when the minutes add up or the monthly subscriptions are a bit much.
StreamAPI is something I will be looking at, where you can build your own custom cam pages. I think it comes to like .45 per Gigabyte of data streamed. will report back on that one...
Thinking of possible hardware solutions, esp for groups of people (Webcams can really only broadcast 1-2 people well), but those solutions get upwards of the "thousands of dollars" per site I think
Not even going to mention telepresence or ISDN :)